Based on general recognition and consistent styling, Rosé is often noted for having the longest hair in Blackpink.
While hair length can change with cuts and extensions, Rosé's signature long, often blonde, locks have been a defining feature of her appearance for a significant portion of her time in Blackpink. Therefore, when considering who generally has the longest hair, Rosé is the most accurate answer. Other members like Lisa, Jennie, and Jisoo have also sported long hairstyles at various times, but Rosé's has been a more consistent and defining characteristic.
